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Visual adaptation and microhabitat choice in Lake Victoria cichlid fish
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Orientador(es)
Resumo(s)
When different genotypes choose different habitats to
better match their phenotypes, genetic differentiation within a
population may be promoted. Mating within those habitats
may subsequently contribute to reproductive isolation. In
cichlid fish, visual adaptation to alternative visual environments
is hypothesized to contribute to speciation. Here, we
investigated whether variation in visual sensitivity causes
different visual habitat preferences, using two closely related
cichlid species that occur at different but overlapping water
depths in Lake Victoria and that differ in visual perception
(Pundamilia spp.). In addition to species differences, we explored
potential effects of visual plasticity, by rearing fish in two
different light conditions: broad-spectrum (mimicking shallow
water) and red-shifted (mimicking deeper waters). Contrary to
expectations, fish did not prefer the light environment that
mimicked their typical natural habitat. Instead, we found an
overall preference for the broad-spectrum environment. We also
found a transient influence of the rearing condition, indicating
that the assessment of microhabitat preference requires repeated
testing to control for familiarity effects. Together, our results
show that cichlid fish exert visual habitat preference but do not
support straightforward visual habitat matching
Descrição
Electronic supplementary material is available
online at https://dx.doi.org/10.6084/m9.figshare.
c.4440182
Palavras-chave
fish microhabitat
Contexto Educativo
Citação
Mameri D, van Kammen C, Groothuis TGG, Seehausen O, Maan ME. 2019 Visual adaptation and microhabitat choice in Lake Victoria cichlid fish. R. Soc. open sci. 6: 181876.
Editora
Royal Society, The